///
// * jdbm LICENSE v1.00
// *
// * Redistribution and use of this software and associated documentation
// * ("Software"), with or without modification, are permitted provided
// * that the following conditions are met:
// *
// * 1. Redistributions of source code must retain copyright
// *    statements and notices.  Redistributions must also contain a
// *    copy of this document.
// *
// * 2. Redistributions in binary form must reproduce the
// *    above copyright notice, this list of conditions and the
// *    following disclaimer in the documentation and/or other
// *    materials provided with the distribution.
// *
// * 3. The name "jdbm" must not be used to endorse or promote
// *    products derived from this Software without prior written
// *    permission of Cees de Groot.  For written permission,
// *    please contact cg@cdegroot.com.
// *
// * 4. Products derived from this Software may not be called "jdbm"
// *    nor may "jdbm" appear in their names without prior written
// *    permission of Cees de Groot.
// *
// * 5. Due credit should be given to the jdbm Project
// *    (http://jdbm.sourceforge.net/).
// *
// * THIS SOFTWARE IS PROVIDED BY THE ndbm PROJECT AND CONTRIBUTORS
// * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
// * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
// * CEES DE GROOT OR ANY CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// * OF THE POSSIBILITY OF SUCH DAMAGE.
// *
// * Copyright 2001 (C) Alex Boisvert. All Rights Reserved.
// * Contributions are Copyright (C) 2001 by their associated contributors.
// *
// 

//*************************************************************************
//**  Included in JDMB 1.0 port to SharpDBM;  11/2013 Cyrus Neah cneah@codingreal.com
//**  SharpDBM is an independent reimplementation of the JDBM 1.0 software library in C#  
//*************************************************************************


using System;
using System.Data;
using System.Text;
namespace SharpDBM.helper
{


///
// * Miscelaneous conversion utility methods.
// *
// * @author <a href="mailto:boisvert@intalio.com">Alex Boisvert</a>
// * @version $Id: Conversion.java,v 1.3 2002/05/31 06:33:20 boisvert Exp $
// 
	public class Conversion
	{

//    *
//     * Convert a string into a byte array.
//     
		public static sbyte[] convertToByteArray(string s)
		{
			
            try
			{
                System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
                Byte[] bytes = encoding.GetBytes(s);
                sbyte[] signed = Array.ConvertAll(bytes, b => (sbyte)b); 

                return signed;
			}
            catch (ArgumentOutOfRangeException uee)
            {
                Console.WriteLine(uee.StackTrace);
                Console.WriteLine("Platform doesn't support UTF8 encoding");
            }
            return null;
		}


//    *
//     * Convert a byte into a byte array.
//     
		public static sbyte[] convertToByteArray(sbyte n)
		{
			n = (sbyte)(n ^ ((byte) 0x80)); // flip MSB because "byte" is signed
			return new sbyte[] { n };
		}


//    *
//     * Convert a short into a byte array.
//     
		public static sbyte[] convertToByteArray(short n)
		{
			n = (short)(n ^ ((Int64) 0x8000)); // flip MSB because "short" is signed
			sbyte[] key = new sbyte[2];
			pack2(key, 0, n);
			return key;
		}


//    *
//     * Convert an int into a byte array.
//     
		public static sbyte[] convertToByteArray(int n)
		{
			n = (int)(n ^ 0x80000000); // flip MSB because "int" is signed
			sbyte[] key = new sbyte[4];
			pack4(key, 0, n);
			return key;
		}


//    *
//     * Convert a long into a byte array.
//     
		public static sbyte[] convertToByteArray(long n)
		{



            sbyte[] signed = Array.ConvertAll(BitConverter.GetBytes(n), b => (sbyte)b); 
           return signed;
		}


//    *
//     * Convert a byte array (encoded as UTF-8) into a String
//     
		public static string convertToString(sbyte[] buf)
		{
            
            try
			{
			
			
				return Convert.ToString(buf);

			}
			catch (ArgumentOutOfRangeException uee)
			{
				Console.WriteLine(uee.StackTrace);
				Console.WriteLine("Platform doesn't support UTF8 encoding");
			}
            return null;
		}


//    *
//     * Convert a byte array into an integer (signed 32-bit) value.
//     
		public static int convertToInt(sbyte[] buf)
		{
            byte[] bytes = Array.ConvertAll(buf, b => (byte)b);
            if (BitConverter.IsLittleEndian)
                Array.Reverse(bytes);

            return BitConverter.ToInt32(bytes, 0);
		}
        public static int convertToInt(byte[] buf)
        {
            
            if (BitConverter.IsLittleEndian)
                Array.Reverse(buf);

            return BitConverter.ToInt32(buf, 0);
        }


        public static short convertToShort(sbyte[] buf)
        {
            byte[] bytes = Array.ConvertAll(buf, b => (byte)b);
            if (BitConverter.IsLittleEndian)
                Array.Reverse(bytes);

            return BitConverter.ToInt16(bytes, 0);
        }

        public static short convertToShort(byte[] buf)
        {
           
            if (BitConverter.IsLittleEndian)
                Array.Reverse(buf);

            return BitConverter.ToInt16(buf, 0);
        }


//    *
//     * Convert a byte array into a long (signed 64-bit) value.
//     
		public static long convertToLong(sbyte[] buf)
		{
            byte[] bytes = Array.ConvertAll(buf, b => (byte)b);
            if (BitConverter.IsLittleEndian)
                Array.Reverse(bytes);

            return BitConverter.ToInt64(bytes, 0);
		}
        public static long convertToLong(byte[] buf)
        {
            
            if (BitConverter.IsLittleEndian)
                Array.Reverse(buf);

            return BitConverter.ToInt64(buf, 0);
        }



		public static int unpack4(sbyte[] buf, int offset)
		{
			int @value = (buf[offset] << 24) | ((buf[offset+1] << 16) & 0x00FF0000) | ((buf[offset+2] << 8) & 0x0000FF00) | ((buf[offset+3] << 0) & 0x000000FF);

			return @value;
		}


		public static void pack2(sbyte[] data, int offs, int val)
		{
			data[offs++] = (sbyte)(val >> 8);
			data[offs++] = (sbyte) val;
		}


		public static void pack4(sbyte[] data, int offs, int val)
		{
			data[offs++] = (sbyte)(val >> 24);
			data[offs++] = (sbyte)(val >> 16);
			data[offs++] = (sbyte)(val >> 8);
			data[offs++] = (sbyte) val;
		}


		public static  void pack8(sbyte[] data, int offs, long val)
		{
			pack4(data, 0, (int)(val >> 32));
			pack4(data, 4, (int) val);
		}


//    *
//     * Test static methods
//     
		static void MainTest()
		{
			sbyte[] buf;

			buf = convertToByteArray((int) 5);
			Console.WriteLine("int value of 5 is: " + convertToInt(buf));

			buf = convertToByteArray((int) -1);
			Console.WriteLine("int value of -1 is: " + convertToInt(buf));

			buf = convertToByteArray((int) 22111000);
			Console.WriteLine("int value of 22111000 is: " + convertToInt(buf));


			buf = convertToByteArray((long) 5L);
			Console.WriteLine("long value of 5 is: " + convertToLong(buf));

			buf = convertToByteArray((long) -1L);
			Console.WriteLine("long value of -1 is: " + convertToLong(buf));

			buf = convertToByteArray((long) 1112223334445556667L);
			Console.WriteLine("long value of 1112223334445556667 is: " + convertToLong(buf));
		}





	}


}